I've never had any issues with mine, but maybe you have a defective heater and really it should work with any level of water flow, be it high or low.
jschall;4018395; said:How much flow past the heater? How long has your heater been set up?
i have the same flow rate as you do
It seems by trusting "lights" rather than a instrument made to measure temperature, isn't working out.jschall;4018395; said:Yeah, it's just got me really depressed because I wanted this thing to work.
The reason I wanted it is so that I could see clearly if it was working.
My LFS has several on display in various tanks that work just fine. They are the lower wattage ones though.
zennzzo;4019597; said:It seems by trusting "lights" rather than a instrument made to measure temperature, isn't working out.
It shouldn't matter how much flow you have around/through/over the heater, because the thermostat is on-board.
All that flow will produce is an evenly heated tank. It should at least be heating the general area around the heater.
IMO, the ONLY way to be sure that a heater is working, is to check the temp with a thermometer. I check my temps at a point, farthest from the heater as possible, with an accurate lab thermometer.
We all have had heaters that had a red/orange neon light up near the top. All that was telling me is that there is electricity up to that point. It still doesn't tell you that the heater is working, that's what my trusty thermometer is for. It just tells you it is supposed to be working in reality.
In the case of the Fluval, that micro processor, is really just a fancy neon light in essence. Even it it would work properly, it can only give you a false sense of security.
The temp of the water is important for fish health.
By taking consistent temperature readings, with an accurate thermometer is the only way to absolutely know for sure what the water temp is. To me, that is where the security really is.
For 50+ dollars, I would think you could/would get a premium quality heater, that is UL listed, and has an accurate, close tolerance thermostat, and set the dial by what your quality Lab grade thermometer says, and not the obviously inaccurate on-board thermometer or dial says.
This is one area, where bells and whistles can be harmful...IMO of course...
I see where you are concerned for your fish, that's why you originally bought into the lights and all, but in all actuality, you are disabling your ability to get "for sure" accurate temp readings by trusting anything except your accurate thermometer...
Maybe it's not too late to return it and get a proper heater...![]()

Best 60 bux I have spent on heating to date...12 Volt Man;4020776; said:^
yes, thats the sort of device I was talking about.